A mannequin dressed as party boy Richie Rich was stolen from the Dropout bash at Don Hill’s Sunday night. The “deejay” is usually a mannequin dressed up as a celebrity seated behind a laptop computer with a programmed playlist. One partygoer told us, “The crowd” — including Rich himself — “was wild and dancing late when two guys apparently rolled the mannequin out the back exit like a drunk date.” Organizers were reviewing security tapes to see if they could nab the thieves, but so far, “Richie” hasn’t been recovered. A rep for the bar didn’t get back to us.